Quote:
Originally Posted by hardtailer
Thanks for your reply.
I connected pin 9 straight to ground. Measuring pin 30, ALE was a saw tooth like shown above for Pin 6 of S890 but later on it was a steady ~Vcc.
Pin 33 and 34 to the (not connected) ICV showed no irregular signal as it did before.
Input signals to uC 8051 AD0 to 7 were all steady voltages for each, no repetitive signal.
What should I be looking for exactly?
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That's not correct! It's a logic output (0 to 5V square wave). Sounds like a short on the PCB. Don't forget about the LS373 (8 bit latch),
it's on same logic bus.